Floor-scraping machine



' 1,614,855 1927' .1. w. STUBBLEFIELD FLOOR S SHAPING MAGHI NE Filed Nov. 22. 1924 2 Sheets-Sheet l Jan. 18, 1927. ,855

. J. W. STUBBLEFIELD FLOOR SCRAPING MACHINE Filed Nov. 22. 1924 2 Sheets-Sheet 2 67067237: JWZZIZZ Patented Jan. 18, 1927.

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This invention relates to wood floor surfacing machines and especially to a power driven means for finishing floors.

It is an object of this invention to provide an improved floor finishing machine which will rapidly and effectively surface a wood floor and give it a smoother surface than has been accomplished by other means heretofore.

It is an object to provide a machine operating with a scraplng action rather than tearing or grindin of the wood surface. Further it is an o ject to provide a machine which operates without discoloring or scorching the wood as commonly occurs with various types of surfacers and especially with sanders.

An object is to provide a machine which can be run close up to the wall and thus eliminate the laborious hand work of pulling the corners by hand scrapers as is necessary after some forms of machine are run over the fioor and which leave lar e untouched areas at the sides of the ooring near walls to be hand pulled.

It is an object to provide a clean cut surface and a surface which is more nearly level than can be obtained by hand work in far more time of operation.

An object is to provide a machine having capacity for instantaneous adjustment, while being propelled across a floor, to regulate the depth of out.

An object is to provide a combined scraper and suction cleaner with the aim of greatly saving labor and time, and to clean up the chips in front of the cutting means as the machine is advanced.

An object is to provide a machine having a scraping means which acts with a movement of scrapers forwardly in the advancing direction of travel of the machine.

An object is to provide means for running on the smooth finished floor behind the scraping means so as to practically eliminate undulations and vibration of the machine and thereby accomplish a smoothly acting scraping means.

It is an object to provide means for enabling motor propulsion of the machine at will of operator.

An ob ect is to provide a machine of few and substantial parts and of compact organization;\ and havin all parts arranged with the aims of accessibility for inspection, renewal and adjustment.

Other objects and advantages will be made manifest in the following specification of an embodiment of apparatus of the invention, it being understood that modification, variation and adaptation may be resorted to within the spirit of the invention and its scope as here claimed. I

Fig. 1 is a left hand, side elevation.

I Fig. 2 is a front elevation.

Fig. 3 is a left side view.

4 is a vertical section on plane 4,

ig. 5 is an end view of the cylinder, broken out.

Fig. 6 is a detail of a helical form of scraping blade and its cylinder, and Fig. 7 is an end view thereof.

Fig. 8 is an end view of a quadruple-edge scraping blade, mounted.

The machine has a suitable frame of top 2 and side walls 3 connected by a dro ping flange 4. The rear end of the frame as a caster roller 5, and an u wardly extending push-handle structure inc uding side stiles 6 and a cross bar 7 On the top 2 is an electric motor M and.

driven by a chain 13 engaging pinion 14 on the motor shaft. Various scraping blades may be secured in and along the cylinder 10, which is referably channelled at 10 to receive the lades.

I have found, by use, that a blade which has a forwardly hooked corner edge is high ly effective. The blade 15 of Fig. 5 has only one hooked, scraping edge 16, while the blade 15 of Fig. 8 has four such effective edges 16 so that the blade can be utilized as a scraper at each of its four longitudinal corners. An effective disposition of such blades in place is at an angle of to a radius cutting the mounted blade. The blade is of an elongated, oblong form in cross-section and perforated to receive screws 18 run into the cylinder 10.

Where necessary, clamp plates 19 may be an axle.11 carrymg, on one end a sproc et wheel 12 employed for securing the scraper blades solidly in place.

While the scrapers are shown as straight in Fig. 4, I may employ helical blades 15' cheek 21 on the other end covering the endsof the cylinder channels. The check 21 has a clearance recess 22 which can be'registcred with the blade ends as the cylinder 1s rotated slowly, after the cheek has been released by removal of its screws 23.

The scraper means may be removed as a unit by'releasing bearing plates 25 secured by screws 26 to the frame walls 3; these being cut away at the front corners. The plates 25 have ball-bearing hubs 2T entering the ends of the cylinder 10 for compactness.

Each plate is apertured at '28 to provide for access to the ends of the scraper blades, as for the insertion of a cold chisel, Fig. 4 to drive out a scraper blade after its screws 18 have been withdrawn, and the cheek freed to turn.

The cylinder is so driven as to sweep-the blades 10 forwardly and up, as indicated, in direction of advance of the machine. This shears off the floor surface in a quick, clean and smooth manner without generating heat enough to discolor the wood. This is an important advantage of the present machine.

The lifted cuttings are gathered by a suction mouth-piece 30 disposed just in front of and along the cylinder and clear of the sweep of the blades. From the mouth-piece a conduit 31 leads to the blower and from this to an air-pervious bag R receiving the cuttings and dust.

Iprovide for instantaneous adjustment of depth of out. For this result roller 33 is positioned in front of the suction mouth 30 and has bearing in end slides 34 shiftable in guides 35 on the side plates 25. The up per ends of the slides engage cams 36 having gears 37 engaging worms 38-on a rock-shaft 39. This rock-shaft extends across the top 2 and has a lever arm 40 from which a link 41 extends up and connects to a hand-lever.

. 42 pivoted on a handle stile 6. A rack and swing on the motor hub. The lower end ofshaft 47 is in a bearing 49 slotted on an are so that it can swing about the motor hub and be set by screws 50. The shaft has a worm 51 to engage a. gear 52 on a' shaft 53' carrying a roller 54 having vertically adjustable end bearings 55.

By my present machine I have accomplished one very important object, and that is,completely finishing the surfacing by and in one operation of the machine thus eliminating the several, various steps ordinarily required by other types of machine commonly used..

By actual experience wtih operation of the present invention, I. have demonstrated that eflicicnt and rapid results are obtained by employing blades which have hooked edges of different sizes; the smaller hooks producing fine cuts'and a clean smooth surface for finish work, while coarser hooks are effective for rougher surfacing. Also the differently hooked scrapers are variously adaptable for use on the several kinds of wood, according to hardness.

It is understood that the present machine has many other uses than that of floor surfacing only, here mentioned.

As the machine is advanced the surface of the floor is scraped off smooth behind roller 33 and the machine is steadied by a transverse roller 58 which bears on the finished floor from which all top wood has been taken off by the scrapers.

A clutch 59 controls driving gears 51-52 for advancing the machine at will by power of the motor.

What is claimed is:

1. A floor scraping machine having, in combination. a frame provided with detachable side bearing plates at the front end and which have apertures, and a cylinder mounted between the plates and having longitudinal blades which are removable endwise through the said plates without necessitating removal of the plates.

2. A floor scraping machine having, in combination, a rotative scraping means, rolling supports, a front adjusting roller, bear ing slides for the roller, a handle bar, and means for adjusting the slides and including a hand-lever adjacent to the handle bar, a cam device for each slide, and connectin mechanism between said cams and the ban lever for shifting the slides.

3. A floor scraping machine having, in combination, a frame provided with detachable side bearing plates having apertures, and a cylinder mounted between the plates and having longitudinal scra ing blades re'- movable endwise through t e plates, and turnable, cheek plates on the ends of the cylinder, each having a recess registerable with the ends of the blades for the insertion and rcmovalthereof.

4. In a floor scraping machine, a rotative carrier provided with longitudinal recesses tangential to the axis of the carrier, and an elongated bit in each recess, each bit having "a pair of outwardly curled scraping corners along each longitudinal edge, said recess being laterally widened at its bottom to clear the out curled corners of the inserted bit,

and means for clamping the bits along the end and whereby name carrier' said. bits being reversible end for side forsideinthe 5. A floor scrapin machine having, in combination, a rotative cutting means including effective. transverse scraping blades, a 'steadying roller disposed at the rear of said means and running on the floor finished by said means,'and rolling means including a roller extending acros in front of the cutti means and having concurrently adjustab e slides for regulating the depth of out, said slides being combined with means they are instantly and uniformly adjusted.

6. A floor scraping machine havin in combination, a rotative cutting means aving transverse scrapers, a stead ing roller close to the rear of said means an travelling on the finished surface,and an unyielding adjustable roller in front of the cutting means'to regulate the de h of cut and having operatively conn adjusting slides, said slides being combined with means whereby they are instantly and uniformly ad'usted.

. A-- floor scrap" machine having, in

combination, a rotative scraping means,- a

steadying roller close the rear of the sore ing means and running on the finished sur ace, an adjustable rolling means in front of the scraping means, and manually o I- able means including connected, sli bearings to instantl adjust the rollin means, said slides in combined wit means whereby they are mstantly and uniformlK adjusted.

8. floor scraping machine having, in combination, a frame, a motor thereon, rolling means supporting the frame, handle means for manual propulsion of the machine, a motor-driven, scraper-bladed cylinder, an adjustable traction roller for motor propulsion of the machine, traction roller driving gearing including a swinging shaft gearedto the motor shaft and an a gtustable r bearing for the swinging sha where to disconnect driving gears when the r0 er is re- I tracted to non-driving position. a 9. A floor scraping machine having, In

combination, scraping means, rollmg su rts behindthe same, a front roller,a han ever, bearing slides for the roller, cams engaging the slides, a rock-shaft geared to the cams, and an operating connection between the rock-shaft and the hand-lever.

J. W. STUBBLEFIELD. 

